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It has nothing to do with the to; that's there to introduce the infinitive ensure. It's the that you should be looking at. It introduces an object complement clause, which in this case is an untensed ("infinitive") construction -- be granted instead of is granted. The be granted construction itself is simply a passive, but it's a passive promoting the indirect object every person to subject, instead of the direct object adequate assistance. LIke the difference between The book was given (to) her and She was given the book.
– John LawlerSep 13 '15 at 16:55